I never had escapees until I started keeping kings and milks. A black milk snake spent 2 months or better on the lam in our basement and a Florida king snake is hiding somewhere in our snake room even now. They are little Houdinis.

I suggest baiting a milk jug or soda bottle with a rodent if the animal is slim enough to fit inside. Otherwise perhaps make a tent with some newspaper and bait with both food and water. Place it next to a wall as they like to move along walls. Appliances that get warm will be attractive hiding spots too. I found one in a bookcase wedged between a couple of books once. Snakes are territorial and I have sometimes found them only a few feet from their cages, by all appearances just wanting to go back home.